Thermodynamic analysis for the gas production from gas hydrate by heating

The one-dimensional model is improved considering the effect of gas hydrate latent,an axisymmetric mathematic modeling is developed for the gas production by heating.Free boundary value problem is solved using Boltzmann-transformation and the analytic solutions for temperature field is obtained.New idea is adopted to solve the non-linear problem caused by the gas hydrate latent,the functional relationship between the location of decomposition front and time is obtained by solving initial value problem for system of ordinary differential equations,more accurate results is obtained.The results show that there is great temperature gradient near the well;The thermal efficiency is improved and the gas generation rate is decreased as the well temperature is increased;The thermal efficiency is improved with the increasing of the dissociation radius at a certain well temperature.New method has theoretical significance,the numerical results has practical significance for increasing thermal efficiency and the gas generation rate from gas hydrate.